The most common side effects of astaxanthin is a harmless natural pigment changes, such as skin or stool color with a little orange. Whether humans or animals, even the intake of large doses, also no toxicant effect could be found. In addition, other less common side effects include decreased blood pressure and hormonal changes and so on.  

Astaxanthin is used by many as animal feed additives, it is also the crab, shrimp, lobster and salmon similar natural pigment of red orange. Astaxanthin is safe to use as animal feed nutrition practices, and most of the people eat seafood fed with astaxanthin will not flush any adverse reactions. Earlier in a dozen years ago, the United States food and Drug Administration took astaxanthin as human consumption of food to one of the ingredients.  

As a dietary product, astaxanthin has often been used as antioxidant to reduce cholesterol. Astaxanthin suppliers suggested astaxanthin in the treatment of carpal tunnel syndrome, arthritis, muscle injuries, diseases such as gastrointestinal discomfort and male infertility. However, it should be noted is that so far no sufficient scientific evidence to support these theories, and they can't prove that this nourishment is indeed a health effect.  

Common astaxanthin side effects including increased pigmentation, hair growth, hormonal changes and lower blood pressure. Sometimes gives rise to reduced calcium levels, such as low libido and male breast increase topic, but very rare. An allergic reaction is possible, and there is the great danger of proportionality. Persons allergic to this material fed with astaxanthin foods should be avoided. 

Astaxanthin and other drug interactions are also worth noting another subject. For example, the effect of antihypertensive drugs might increase due to ingestion of astaxanthin, and easily lead to dramatically reduce dangerous blood pressure. Hormone therapy and contraceptive effects can also be affected by the nutrition. In addition, the antihistamine drug and an asthma drug can also interact with astaxanthin reaction. Because clears of drugs in the blood from the liver enzymes will also be affected, thus resulting in increased residual drugs in the blood stream can.  

Astaxanthin and other health care products and herbal supplements interact reaction is possible as cosmetic raw material. For example, with the intake and saw palmetto, black cohosh and other drugs may affect hormone levels. Lower blood pressure side effects will also reduce calcium levels. In addition, β-carotene and lycopene and other carotenoids as antioxidants and astaxanthin with the intake will also reduce the absorption, so it is not recommended practice.